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• W2187723736 abstract "Drilling at Limalok (Site 871) and Wodejebato (Site 874) guyots, Republic of the Marshall Islands, during Ocean Drilling Program Leg 144, revealed that -289 and -163 m of shallow-water limestones overlie volcanic substrate at these sites, respectively. Hole 871C was drilled in the central lagoon at Limalok at a water depth of 1255 m, whereas Hole 874B was drilled on an inner perimeter ridge at Wodejebato at a water depth of 1374 m. Shipboard biostratigraphy indicates that neritic limestones from Hole 871C are late Paleocene to middle Eocene, whereas limestones from Hole 874B are Maastrichtian. We have combined petrography and isotope geochemistry (δ'8O, δ'3C, 87Sr/86Sr) to constrain the diagenetic histories of these two guyots. Carbonates from Holes 871C and 874B primarily consist of grainstones, packstones, and wackestones that exhibit moldic and vuggy porosity. Hole 871C samples are moderately well cemented with equant, microspar calcite. Cements in Hole 874B carbonates are generally coarser and more abundant, primarily with prismatic and radiaxial equant to bladed forms. The vast majority of Hole 871C samples are non-cathodoluminescent, whereas Hole 874B samples from -116 to 163 mbsf display dull to bright cathodoluminescence. Oxygen and carbon isotope values of matrix and cement samples from Hole 871C range from -5.28‰ to 0.50‰ and -0.68‰ to 2.33‰, respectively. Most samples from Hole 874B have δ l8 0 values that cluster between -1.91‰ and -0.20‰; however, six bivalve samples have lower δ18θ values ranging from -4.34‰to -3.07‰. The δ13C values of carbonates from Hole 874B range from 0.92‰to 3.13%e. Depleted oxygen isotope values (less than -3%c) are consistent with diagenetic alteration with meteoric water at low water/rock ratios. Sr-isotope ratios from Hole 871C samples are consistent with an early Paleogene age; however, the temporal resolution of seawater Sr isotopes is minimal during this time. For Hole 874B, strontium-isotope analyses of 36 samples indicate that the 87Sr/86Sr ratio varies from 0.707869 ± 0.000009 (Maastrichtian, -67 Ma) near the top of the sequence to 0.707730 ± 0.000012 (latest Campanian, -72 Ma) near the base. The Campanian/Maastrichtian boundary is most likely between 136.66 and 143.66 mbsf, based upon Sr isotopes." @default.
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• W2187723736 title "23. PRELIMINARY INVESTIGATION OF THE PETROGRAPHY AND GEOCHEMISTRY OF LIMESTONES AT LIMALOK AND WODEJEBATO GUYOTS (SITES 871 AND 874), REPUBLIC OF THE MARSHALL ISLANDS1" @default.
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